JP6374212B2 - cable clamp - Google Patents

Description

  The present invention relates to a cable clamp.

  The cable clamp is fixed so that the position of the cable does not move when the cable inserted through the wall of the housing of the communication device is exposed to external force, and the electrical connection between the cable and the board is maintained. It is a device for doing.

  In Patent Document 1, as shown in FIG. 6, a strain relief element 130 having a helical structure 131 is rotated to reduce the diameter of the structure 131, and a cable passed through the helix is fastened and fixed. A ground 100 is described.

As members for holding the both ends of the strain relief element 130, there are a screw head 110 and a cable outlet pipe piece 120, respectively. The screw head 110 has a screw 113, and the cable outlet pipe piece 120 has a screw 121. These two screws are screwed together to be tightened and released. The strain relief element 130 has a positioning projection 134 which is fitted into the recess 111 of the screw head 110 and fixed. The strain relief element 130 has an annular thread 132 which is screwed into a thread 121 inside the cable outlet pipe piece 120 and fixed. (FIGS. 1 to 4 and paragraphs (0043) to (0048) of the same document)
Patent Document 2 is an invention relating to a terminal capable of connecting a cable regardless of the conductor diameter of the cable to be connected. In the paragraph (0020) of the same document, there is the following description as a method of fastening a cable using the fastening member 46. “… When the contact is stopped and the rotational force is increased, the rotation of the housing 12 is stopped and the hand is released. Then, the stopper 14 is fitted into the square hole 8 at the square hole 8 closest to the place where the rotation is stopped. In the paragraphs (0014) and (0016), one end 11a of the spring 11 for fastening the speaker cable 45 is fixed to the terminal block 2, and the other end 11b of the spring 11 is a hollow portion. It is described that it is fixed by a groove 12c of 12a. In addition, there is no clear description about the fixing method to the terminal block 2 of the other edge part 11b.

  Further, Patent Document 3 has the following description. The end 8a of the spiral spring 8 is fitted into the groove 9b of the first casing 9, and the other end 8b of the spring 8 is fitted into the groove 10d of the second casing 10, so that the first and second casings are fitted. , The diameter of the spring 8 is reduced, and the lead wire 45a of the speaker cable 45 is tightened and gripped. (Paragraph (0019) to (0023) paragraphs, FIGS. 1 and 2)

Special table 2013-532935 gazette JP 2001-006766 A JP 11-31544 A

  In order to prevent the cable from being pulled out even if the cable is pulled, it is necessary to fasten and fix the spiral structure portion with a sufficient force. Therefore, a force is applied to both ends of the helical structure. In Patent Documents 1 to 3, the method of fixing the end of the helical structure is a structure in which a protrusion is sandwiched between recesses or a structure in which a screw thread is provided and screwed. In the structure in which the protrusion is sandwiched between the recesses, it may come off when a strong force is applied, and the threading method cannot be fixed sufficiently because the length of the screw thread cannot be made long. If the length of the screw thread is increased, the length of the spiral structure portion is also increased.

  An object of the present invention is to provide a cable clamp that can fasten and fix a helical structure with a sufficient force so that the cable does not come out even when the cable is pulled.

  The present invention includes a flexible spiral member and a space for housing the spiral member, and a cylindrical first member that can be fixed to one end of the spiral member and can be divided in a direction to sandwich a cable. And a space for housing the spiral member, the other end of the spiral member can be fixed, coupled to the first housing, and provided with a structure for attaching to the object. A cable clamp comprising a cylindrical second casing that can be divided in a sandwiching direction.

  ADVANTAGE OF THE INVENTION According to this invention, the cable clamp which can clamp | tighten and fix a helical structure part with sufficient force so that it may not come out even if a cable is pulled can be provided.

It is a perspective view which shows the electronic device using the cable clamp of embodiment of this invention. It is sectional drawing which shows the cable clamp of embodiment of this invention, (a) shows before cable tightening, (b) shows after cable tightening. It is a perspective view which shows the structure of the cable clamp of embodiment of this invention. It is sectional drawing which shows other embodiment of this invention. It is a perspective view which shows the example of the shape of the steel plate of other embodiment of this invention. It is a perspective view which shows the cable gland of patent document 1. FIG.

Next, a cable clamp according to an embodiment of the present invention will be described in detail with reference to the drawings.
(Description of configuration)
The configuration of the cable clamp will be described based on the perspective view of FIG. 1, the cross-sectional views of FIGS. 2A and 2B, and the external perspective view of FIG. This cable clamp is used for an electronic device connected to the outside using a cable. It is assumed that the connection destination of the cable in the electronic device is on the board and that the cable and the board are directly connected by soldering instead of using a connector.

  The cable clamp 1 includes a cylindrical first casing 2, a cylindrical second casing 3, a spirally wound steel plate 4, and a screw 5. The first housing 2 can be attached to the second housing 3, and the second housing 3 can be attached to the attached housing 7. Further, the steel plate 4 is fixed by a first housing 2 and a second housing 3 as shown in FIG. The material of the first casing 2 and the second casing 3 is resin or metal. The clamp 11 in FIG. 1 is for taking the cable ground, and the shield 6a is for shielding the cable.

  As shown in FIG. 3, the first casing 2 includes a casing A and a casing B. The casing A and the casing B have a shape obtained by dividing the cylindrical first casing 2 in half in the direction in which the cable is sandwiched. Four recesses 2d are provided on the surface of the housing A facing the housing B, while three protrusions that fit into the three recesses 2d of the housing A are provided on the surface of the housing B facing the housing A. A portion 2h and a pin 2i are provided. The pin 2 i is for fixing the end 4 a of the steel plate 4. The steel plate 4 is fixed by fitting the end 4a between the facing surfaces of the casing A and the casing B. It should be noted that the periphery of the bottom of the pin 2i is thicker than the other facing surface of the housing B so that a gap does not occur when the facing surfaces of the housing A and the housing B are combined with the end 4a interposed therebetween. It is lowered by the minute.

  The second housing 3 includes a cylindrical housing C and a housing D, and the housing C is provided with five recesses 3c. The housing D is provided with pins 3h for fixing the four convex portions 3g and the end 4b of the steel plate 4, and each fits with the concave portion 3c of the housing C. The end 4b of the steel plate 4 is sandwiched between the housing C and the housing D, and the steel plate 4 is fixed by fitting. It should be noted that the periphery of the bottom of the pin 3h is the thickness of the end 4b from the other facing surface of the housing D so that no gap is generated when the facing surfaces of the housing C and the housing D are combined with the end 4b interposed therebetween. It is lowered by the minute.

  As shown in FIG. 3, the cable clamp 1 is provided with a screw portion 3 f on the side opposite to the side facing the first casing 2 of the second casing 3, and can be attached to the mounted casing 7. It is possible. The first housing 2 has a screw portion 2b and a screw portion 2f, and can be attached to the screw portion 3b and the screw portion 3e provided on the inner surface of the second housing 3.

  The steel plate 4 has an end 4 a fixed to the first housing 2 and an end 4 b fixed to the second housing 3. In the state where the cable clamp 1 is fixed to the mounted housing 7, the inner diameter of the steel plate 4 accommodated in the cable clamp 1 can be increased by rotating the first housing 2 clockwise in FIG. Get smaller. Using this, the cable 6 inserted through the inside of the cable clamp 1 is fastened and fixed by the steel plate 4. When tightening and fixing, the first casing 2 and the second casing 3 are coupled to each other by the screw portions 2b, 2f, 3b, and 3e, so that the inner diameter of the steel plate 4 can be finely adjusted.

In order to fix the tightening of the cable, the second casing 3 has an insert nut 5e, the first casing 2 has hollow holes 2c, 2g, and the screws 5 It is possible to fix the rotation. Since the tightening force varies depending on the hardness and diameter of the cable, a plurality of hollow holes 2c and 2g are provided so that the tightening force can be selected.
(Description of operation)
First, the cable clamp 1 is assembled. For the assembly, first, the concave portion 3c of the casing C and the pin 3h and the convex portion 3g of the casing D are fitted together. At that time, the end 4b of the steel plate 4 is sandwiched between one of the recesses 3c and the pin 3h. After that, the concave portion 2d of the housing A and the pin 2i and the convex portion 2h of the housing B are fitted together. At that time, the end 4a of the steel plate 4 is sandwiched between one of the recesses 2d and the pin 3h. Next, the screw portions 2 b and 2 f of the first housing 2 are slightly screwed into the screw portions 3 b and 3 e of the second housing 3. At this time, the inner diameter of the spirally wound steel plate 4 accommodated inside is sufficiently larger than the outer diameter of the cable. In this state, the cable clamp 1 is attached to the case 7 to be attached. Specifically, the screw portion 3 f of the second housing 3 is screwed into the screw portion formed inside the hole of the mounted housing 7, and the cable clamp 1 is fixed to the mounted housing 7. Next, the cable 6 is inserted through the center of the cable clamp 1 to connect the cable 6 and the substrate 8. The substrate 8 is a printed circuit board or the like. FIG. 2A shows a cross section in this state. The cable 6 is a coaxial cable, for example.

  Next, when the cable clamp 1 is rotated clockwise and screwed, the inner diameter of the steel plate 4 becomes smaller and the cable 6 is tightened. FIG. 2B shows a cross-section in the tightened state.

  Finally, in order to fix the cable with an arbitrary tightening force, the hollow hole closest to the insert nut 5e is selected from the total of six hollow holes 2c and 2g shown in FIG. It fixes to the housing | casing 3. In some cases, the rotational position of the hollow hole may not be in a positional relationship where the screw 5 can be screwed into the insert nut 5e due to various cable thicknesses. At that time, the first housing 2 is slightly rotated clockwise or counterclockwise so as to be in a positional relationship for screwing. In the present embodiment, since there are six hollow holes 2c and 2g, it is rotated by a maximum of 30 °. It can be fixed more firmly by rotating clockwise and screwing in.

  As described above, in the present embodiment, the first and second casings 2 and 3 are divided in the direction in which the cable is sandwiched, and the ends 4a and 4b of the steel plate 4 are sandwiched between the casings themselves. Therefore, the steel plate 4 can be tightened with a sufficient force, and the possibility that the steel plate 4 and the housing are detached is small. Further, since the holes formed in the end portions 4a and 4b of the steel plate 4 are fixed by the pins 2i and 3h formed in the divided first or second casing, the possibility of coming off is low even when a strong force is applied. Further, unlike the screwing method disclosed in Patent Document 1, the length of the spiral structure portion does not increase.

Moreover, when using resin for the material of the 1st, 2nd housing | casing of this embodiment, it will become easy to shape | mold if it is a divided structure. Furthermore, it becomes easy to mold a screw part and a pin.
(Another embodiment of the invention)
As shown in FIG. 4, a rubber tube 9 having flexibility can be added to the inside of the steel plate 4. When the first housing 2 is rotated and the cable is tightened, the tube 9 is first tightened and deformed, and the tube 9 directly tightens the cable 6. Therefore, the frictional force and contact area between the cable 6 and the steel plate 4 are increased. As a result, the cable 6 can be more stably fixed, and the resistance of the cable 6 in the pulling direction can be improved.

  By adding a flexible rubber tube 9 to the inside of the steel plate 4, the contact area and the frictional force when the cable is tightened are increased. The cable 6 and the tube 9 are in close contact with each other, and the tensile strength can be improved.

  Further, if a groove is formed in the second housing 3 and the mounted housing 7 and a waterproof packing such as an O-ring 10 is added thereto, water and dust from entering the housing from the outside can be prevented. Is possible.

  In FIG. 4, the outer diameter of the outer end 9 ′ of the tube 9 is widened, and a recess into which the outer end 9 ′ is fitted inside the second housing 3 at a position corresponding to the widened portion is formed. The tube 9 can be prevented from shifting in the cable clamp 1.

  Moreover, as shown in FIG. 5, the frictional force given to the cable 6 is improved by making the surface of the inner surface 4c in contact with the cable 6 of the steel plate 4 rough. Even if there are irregularities on the cable surface, it follows, so that the force for tightening the cable 6 can be suppressed from decreasing, and the tensile strength can be improved.

  In addition, the shape of the steel plate 4 may not be a plate shape, and the cross-sectional shape is not limited as long as a spiral shape can be formed. Further, the steel plate 4 may be made of phosphor bronze in addition to steel, and can be used in a string shape by adding a tube to the inside of the steel plate 4.

  As an application example of the present invention, when a cable inserted through a wall of a casing of a communication device or the like is exposed to an external force, it is used for a cable clamp for maintaining an electrical connection between the cable and the board. be able to. Moreover, it can also be used for a cable clamp for preventing dust, water and the like from a gap between the inserted cable and the wall on the housing side from entering the inside of the housing.

DESCRIPTION OF SYMBOLS 1 Cable clamp 2 1st housing | casing A, B, C, D Housing | casing 2b, 2f, 3b, 3e, 3f Screw part 2c, 2g Hollow hole 2d, 3c Concave part 2h, 3g Convex part 2i, 3h Pin 3 2nd 4 Steel plate 4a, 4b End 4c Inner surface 5 Screw 5e Insert nut 6 Cable 6a Shield 7 Mounted housing 8 Substrate 9 Tube 10 O-ring 11 Clamp

Claims (7)

A spiral member having flexibility, and a cylindrical first housing that includes a space for housing the spiral member and can be divided in a direction in which one end of the spiral member can be fixed and the cable is sandwiched. ,
A space for accommodating the helical member is provided, the other end of the helical member can be fixed, and the first housing is connected to the first housing so that it can be divided into a direction to sandwich the cable. A cable clamp comprising a cylindrical second casing.   One end of the spiral member is fixed by being sandwiched between the divided first casings, and the other end of the spiral member is fixed by being sandwiched between the split second casings. The cable clamp according to claim 1. A pin is provided on one divided side of the first casing or the second casing, a hole for fitting the pin is provided on the other side, and the pin penetrates both ends of the spiral member. 3. The cable clamp according to claim 1, wherein a hole is provided, and the pin is fixed by sandwiching a hole through which the pin at both ends of the spiral member passes by a hole in which the pin fits.
  The cable clamp according to any one of claims 1 to 3, further comprising a fixing mechanism that fixes the first housing at a plurality of rotational positions.   The cable clamp according to any one of claims 1 to 4, further comprising a flexible tube inside the spiral member.   The cable clamp according to any one of claims 1 to 5, wherein a waterproof packing is inserted between the second casing and the object.   The cable clamp according to any one of claims 1 to 6, wherein a surface of the spiral member that contacts the cable is a rough surface.

Images